/*
   Copyright (c) 2014 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.

   This file is licensed to you under your choice of the GNU Lesser
   General Public License, version 3 or any later version (LGPLv3 or
   later), or the GNU General Public License, version 2 (GPLv2), in all
   cases as published by the Free Software Foundation.
*/

#include <glusterfs/xlator.h>
#include <glusterfs/defaults.h>

#include "meta-mem-types.h"
#include "meta.h"
#include <glusterfs/strfd.h>
#include <glusterfs/lkowner.h>

static int
frames_file_fill(xlator_t *this, inode_t *file, strfd_t *strfd)
{
    struct call_pool *pool = NULL;
    call_stack_t *stack = NULL;
    call_frame_t *frame = NULL;
    int i = 0;
    int j = 1;

    if (!this || !file || !strfd)
        return -1;

    pool = this->ctx->pool;

    strprintf(strfd, "{ \n\t\"Stack\": [\n");

    LOCK(&pool->lock);
    {
        list_for_each_entry(stack, &pool->all_frames, all_frames)
        {
            strprintf(strfd, "\t   {\n");
            strprintf(strfd, "\t\t\"Number\": %d,\n", ++i);
            strprintf(strfd, "\t\t\"Frame\": [\n");
            j = 1;
            list_for_each_entry(frame, &stack->myframes, frames)
            {
                strprintf(strfd, "\t\t   {\n");
                strprintf(strfd, "\t\t\t\"Number\": %d,\n", j++);
                strprintf(strfd, "\t\t\t\"Xlator\": \"%s\",\n",
                          frame->this->name);
                if (frame->begin.tv_sec)
                    strprintf(strfd, "\t\t\t\"Creation_time\": %d.%09d,\n",
                              (int)frame->begin.tv_sec,
                              (int)frame->begin.tv_nsec);
                strprintf(strfd, " \t\t\t\"Refcount\": %d,\n",
                          frame->ref_count);
                if (frame->parent)
                    strprintf(strfd, "\t\t\t\"Parent\": \"%s\",\n",
                              frame->parent->this->name);
                if (frame->wind_from)
                    strprintf(strfd, "\t\t\t\"Wind_from\": \"%s\",\n",
                              frame->wind_from);
                if (frame->wind_to)
                    strprintf(strfd, "\t\t\t\"Wind_to\": \"%s\",\n",
                              frame->wind_to);
                if (frame->unwind_from)
                    strprintf(strfd, "\t\t\t\"Unwind_from\": \"%s\",\n",
                              frame->unwind_from);
                if (frame->unwind_to)
                    strprintf(strfd, "\t\t\t\"Unwind_to\": \"%s\",\n",
                              frame->unwind_to);
                strprintf(strfd, "\t\t\t\"Complete\": %d\n", frame->complete);
                if (list_is_last(&frame->frames, &stack->myframes))
                    strprintf(strfd, "\t\t   }\n");
                else
                    strprintf(strfd, "\t\t   },\n");
            }
            strprintf(strfd, "\t\t],\n");
            strprintf(strfd, "\t\t\"Unique\": %" PRId64 ",\n", stack->unique);
            strprintf(strfd, "\t\t\"Type\": \"%s\",\n", gf_fop_list[stack->op]);
            strprintf(strfd, "\t\t\"UID\": %d,\n", stack->uid);
            strprintf(strfd, "\t\t\"GID\": %d,\n", stack->gid);
            strprintf(strfd, "\t\t\"LK_owner\": \"%s\"\n",
                      lkowner_utoa(&stack->lk_owner));
            if (i == (int)pool->cnt)
                strprintf(strfd, "\t   }\n");
            else
                strprintf(strfd, "\t   },\n");
        }
        strprintf(strfd, "\t],\n");
        strprintf(strfd, "\t\"Call_Count\": %d\n", (int)pool->cnt);
        strprintf(strfd, "}");
    }
    UNLOCK(&pool->lock);

    return strfd->size;
}

static struct meta_ops frames_file_ops = {
    .file_fill = frames_file_fill,
};

int
meta_frames_file_hook(call_frame_t *frame, xlator_t *this, loc_t *loc,
                      dict_t *xdata)
{
    meta_ops_set(loc->inode, this, &frames_file_ops);
    return 0;
}
